US20250219485A1 - Rotor, electric motor, fan, ventilator, and air conditioner - Google Patents

Rotor, electric motor, fan, ventilator, and air conditioner Download PDF

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Publication number
US20250219485A1
US20250219485A1 US18/704,714 US202118704714A US2025219485A1 US 20250219485 A1 US20250219485 A1 US 20250219485A1 US 202118704714 A US202118704714 A US 202118704714A US 2025219485 A1 US2025219485 A1 US 2025219485A1
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US
United States
Prior art keywords
electric motor
conductive
rotor
rotor part
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/704,714
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English (en)
Inventor
Kazuhiko Baba
Atsushi Matsuoka
Junichi Ozaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OZAKI, JUNICHI, BABA, KAZUHIKO, MATSUOKA, ATSUSHI
Publication of US20250219485A1 publication Critical patent/US20250219485A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present disclosure relates to a rotor, an electric motor, a fan, a ventilator, and an air conditioner.
  • a technology is proposed to prevent electrolytic corrosion in a bearing by adjusting the rotor capacitance from 3 pF to 12 pF by adjusting the dielectric constant of a resin magnet such as a bonded magnet, which constitute the rotating body of an electric motor, to 10 or more and 40 or less (see, for example, Patent Reference 1).
  • a rotor of the present disclosure includes:
  • An electric motor of the present disclosure includes:
  • the direction parallel to the axis A 1 is also referred to as the “axial direction of the rotor 2 ” or simply the “axial direction.”
  • a radial direction refers to a direction along a radius of the rotor 2 , a stator 3 , or a stator core 31 , and refers to a direction orthogonal to the axis A 1 .
  • An xy plane refers to a plane orthogonal to the axial direction.
  • a circumferential direction of the rotor 2 , the stator 3 , or the stator core 31 is also simply referred to as the “circumferential direction.”
  • FIG. 1 is a cross-sectional view schematically showing the electric motor 1 according to the first embodiment.
  • the electric motor 1 may further include electric circuitry 6 and a connector 7 .
  • the rotor 2 and the stator 3 are disposed in the conductive housing 5 .
  • the stator 3 includes the stator core 31 , at least one insulator 32 , at least one coil 33 , and at least one conductive pin 34 .
  • Each coil 33 is wound on the insulator 32 .
  • the stator 3 is press-fitted into a frame 5 A of the conductive housing 5 . That is, the outer peripheral surface of the stator 3 (e.g., the outer peripheral surface of the stator core 31 ) is in contact with the conductive housing 5 .
  • FIG. 2 is a perspective view schematically showing the stator 3 .
  • FIG. 2 the coil 33 is removed from the stator 3 to show the structure of the stator core 31 and the insulator 32 .
  • the stator core 31 includes a yoke 31 A extending in the circumferential direction and a plurality of teeth 31 B.
  • the stator core 31 includes 12 teeth 31 B.
  • Each of the teeth 31 B extends in the radial direction from the yoke 31 A.
  • the stator core 31 is a cylindrical core.
  • the stator core 31 is formed of a plurality of electrical steel sheets laminated in the axial direction. In this case, each of the plurality of electrical steel sheets is formed into a predetermined shape with blanking. These electrical steel sheets are fixed to each other by caulking, welding, gluing, or the like.
  • the coil 33 is a three-phase coil with U-phase, V-phase, and W-phase.
  • Each insulator 32 is provided on the tooth 31 B.
  • Each insulator 32 is a thermoplastic resin, such as polybutylene terephthalate (PBT), etc.
  • PBT polybutylene terephthalate
  • Each insulator 32 electrically insulates the stator core 31 (specifically, each of the teeth 31 B of the stator core 31 ).
  • the insulator 32 is unitedly molded with the stator core 31 .
  • the insulator 32 may be molded in advance, and the molded insulator 32 may be combined with the stator core 31 .
  • Each conductive pin 34 is fixed to the insulator 32 , for example. Each conductive pin 34 electrically connects the coil 33 and the electric circuitry 6 . Specifically, each conductive pin 34 electrically connects the coil 33 and a switching circuit 64 b of an inverter circuit 64 of the electric circuitry 6 .
  • FIG. 3 is a circuit diagram showing an example of the electric circuitry 6 .
  • the electric circuitry 6 includes a fuse 61 , a filter circuit 62 , a power circuit 63 , and an inverter circuit 64 .
  • the electric circuitry 6 is configured to be electrically connected to an AC power source 60 .
  • an AC current (e.g., 100 VAC to 240 VAC) is supplied to the electric circuitry 6 from the AC power source 60 , the AC current is supplied to the power circuit 63 through the fuse 61 and the filter circuit 62 . The AC current is converted to a DC current by the power circuit 63 .
  • the filter circuit 62 includes a capacitor 62 a , a common mode choke coil 62 b , and Y capacitors 62 c and 62 d . With this configuration, the filter circuit 62 composes a noise filter.
  • the power circuit 63 includes a rectifier circuit 63 a , a smoothing capacitor 63 b , and a switching power supply 63 c .
  • an AC current input through the filter circuit 62 is full-wave rectified by the rectifier circuit 63 a having a diode bridge and converted into a DC current.
  • the DC current is accumulated in the smoothing capacitor 63 b .
  • the smoothing capacitor 63 b the DC current (e.g., 140 VDC or 280 VDC) required at the switching circuit 64 b is generated.
  • the switching power supply 63 c uses the DC current generated in the smoothing capacitor 63 b to generate the control power (e.g., 15 VDC) required at a driving circuit 64 a.
  • the inverter circuit 64 includes a driving circuit 64 a and a switching circuit 64 b .
  • the switching circuit 64 b composes a three-phase bridge, which having U-phase, V-phase, and W-phase, formed between the positive and negative bus bars.
  • the positive bus bar is connected to the positive terminal of the smoothing capacitor 63 b
  • the negative bus bar is connected to the negative terminal of the smoothing capacitor 63 b .
  • the three transistors on the positive bus bar side are upper arm transistors.
  • the three transistors on the negative bus bar side are lower arm transistors.
  • Each switching device is connected to a reflux diode in reverse parallel.
  • the respective end connections of the upper-arm and lower-arm transistors compose output ends and are connected to the U-phase, the V-phase, and the W-phase of the coil 33 , respectively.
  • the driving circuit 64 a generates PWM signals to drive the six switching devices of the switching circuit 64 b on and off.
  • the electric motor 1 is driven by magnetic pole position sensorless drive without a magnetic pole position sensor such as a Hall IC.
  • the electric motor 1 includes a magnetic pole position estimation means for estimating the magnetic pole position of the rotor 2 .
  • the magnetic pole position estimation means estimates the position of the rotor 2 from a current flowing in the coil 33 and a motor constant, and generates PWM signals to control a current supplied to each phase of the coil 33 . As a result, the rotor 2 rotates.
  • the rotor 2 is rotatably disposed inside the stator 3 .
  • An air gap exists between the rotor 2 and the stator 3 .
  • the rotor 2 includes a conductive shaft 21 , a rotating body 22 , and first and second bearings 23 , 24 that rotatably support the conductive shaft 21 .
  • the rotor 2 is rotatable about the rotation axis (i.e., axis A 1 ).
  • the rotating body 22 is fixed to the conductive shaft 21 .
  • the rotating body 22 is located between the first bearing 23 and the second bearing 24 .
  • the conductive shaft 21 is rotatably supported by the first bearing 23 and the second bearing 24 .
  • the conductive shaft 21 is made of metal, such as, for example, iron.
  • the load side of the conductive shaft 21 protrudes outside the conductive housing 5 , and the anti-load side of the conductive shaft 21 does not protrude outside the conductive housing 5 .
  • the outer diameter of the end of the conductive shaft 21 at the anti-load side is smaller than the outer diameter of the rest of the conductive shaft 21 .
  • the non-conductive member 4 covers the end of the conductive shaft 21 at the anti-load side.
  • a blade is provided on the load side of the conductive shaft 21 to generate airflow.
  • the non-conductive member 4 covers the end of the conductive shaft 21 at the anti-load side, the bearing voltage in the second bearing 24 can be reduced.
  • a non-conductive member may be provided on the load side of the conductive shaft 21 . In this case, the bearing voltage in the first bearing 23 can be reduced.
  • FIG. 4 is a cross-sectional view schematically showing the structure of the rotating body 22 .
  • the rotating body 22 includes an outer rotor part 22 A and an inner rotor part 22 B provided inside the outer rotor part 22 A.
  • the outer rotor part 22 A is ring-shaped.
  • the outer rotor part 22 A is disposed outside the inner rotor part 22 B and is united with the inner rotor part 22 B.
  • the conductive shaft 21 is fixed inside the inner rotor part 22 B.
  • D1 is the outer diameter of the outer rotor part 22 A
  • D2 is the inner diameter of the outer rotor part 22 A
  • D3 is the outer diameter of the inner rotor part 22 B
  • D4 is the inner diameter of the inner rotor part 22 B.
  • D2 D3.
  • the outer rotor part 22 A forms the magnetic poles of the rotor 2 (specifically, the rotating body 22 ).
  • the outer rotor part 22 A is oriented along the applied magnetic field.
  • the orientation of the magnetic field is a polar anisotropic orientation.
  • the outer rotor part 22 A has alternating N and S poles in the circumferential direction.
  • the rotating body 22 (specifically, the outer rotor part 22 A) forms eight poles.
  • the number of magnetic poles is not limited to eight. For example, the number of magnetic poles need only be two or more and need not necessarily be eight.
  • the outer rotor part 22 A is disposed at the outermost circumference of the rotating body 22 .
  • the outer rotor part 22 A is a bonded magnet.
  • the inner rotor part 22 B is an insulating material containing resin, elastomer, air, or the like.
  • the measurement of the relative permittivity ⁇ r of a bonded magnet containing ferrite has been actually performed.
  • a dice-shaped square piece was fabricated, aluminum foil was attached to the opposite side of the square piece, the capacitance between the two ends was measured with an LCR meter, and then the relative permittivity was calculated from the results obtained using the following formula. It should be noted that the measurement conditions for the capacitance were a frequency of 16 kHz, a voltage of 1.5 V, and a temperature of 20° C.
  • FIG. 5 is a graph showing the reduction rate of bearing voltage in the electric motor 1 according to the first embodiment with respect to an electric motor under comparison.
  • the vertical axis indicates the reduction rate of the bearing voltage in the electric motor 1 according to the present embodiment with respect to the bearing voltage in the electric motor under comparison. In other words, the vertical axis indicates that the larger the reduction rate, the smaller the bearing voltage, and the bearing voltage becomes 0 V at a reduction rate of 100%.
  • the rotating body has a ring shape with an outer diameter is ⁇ 42 mm and an inner diameter is ⁇ 8 mm, and the rotating body consists of a bonded magnet with a relative permittivity of 200. In other words, in the electric motor under comparison, the rotating body consists only of a bonded magnet.
  • the reduction rate of the bearing voltage with respect to the comparable rotor varies almost linearly up to approximately 80%, and the rate of change decreases gradually in the range of a reduction rate of 80% or more.
  • (D3 ⁇ D4)/(D1 ⁇ D2) is 0.15. Therefore, when (D3 ⁇ D4)/(D1 ⁇ D2) is 0.15 or more, the bearing voltage can be effectively reduced and the bearing life can be extended.
  • the first bearing 23 includes a first conductive inner ring 23 A, a first conductive outer ring 23 B, and two or more balls 23 C.
  • the two or more balls 23 C are disposed between the first conductive inner ring 23 A and the first conductive outer ring 23 B.
  • Each ball 23 C is conductive.
  • a lubricant is applied to each ball 23 C.
  • the lubricant applied to each ball 23 C is non-conductive.
  • the first conductive inner ring 23 A, the first conductive outer ring 23 B, and each ball 23 C are made of, for example, metal, such as iron.
  • the first conductive inner ring 23 A is fixed to the conductive shaft 21 . That is, the first conductive inner ring 23 A is in contact with the conductive shaft 21 .
  • the first conductive inner ring 23 A is fixed to the conductive shaft 21 by, for example, press fit or adhesive.
  • a thin oil film layer is formed between the outer peripheral surface, which is the raceway surface of the first conductive inner ring 23 A, and each ball 23 C, and a thin oil film layer is formed between the inner peripheral surface, which is the raceway surface of the first conductive outer ring 23 B, and each ball 23 C.
  • the first conductive inner ring 23 A and the first conductive outer ring 23 B are electrically insulated from each ball 23 C.
  • the outer diameter of the first bearing 23 (specifically, the first conductive outer ring 23 B) is approximately equal to the inner diameter of a first housing 51 of the frame 5 A.
  • the first bearing 23 (specifically, the first conductive outer ring 23 B) is fixed to the first housing 51 by, for example, press fit or adhesive.
  • the first conductive outer ring 23 B is in contact with the conductive housing 5 .
  • the first bearing 23 (specifically, the first conductive outer ring 23 B) may be disposed in the first housing 51 by clearance fit.
  • the second bearing 24 includes a second conductive inner ring 24 A, a second conductive outer ring 24 B, and two or more balls 24 C.
  • the two or more balls 24 C are disposed between the second conductive inner ring 24 A and the second conductive outer ring 24 B.
  • Each ball 24 C is conductive.
  • a lubricant is applied to each ball 24 C.
  • the lubricant applied to each ball 24 C is non-conductive.
  • the second conductive inner ring 24 A, the second conductive outer ring 24 B, and each ball 24 C are made of, for example, metal, such as iron.
  • the second conductive inner ring 24 A is fixed to the non-conductive member 4 by, for example, press fit or adhesive.
  • a thin oil film layer is formed between the outer peripheral surface, which is the raceway surface of the second conductive inner ring 24 A, and each ball 24 C, and a thin oil film layer is formed between the inner peripheral surface, which is the raceway surface of the second conductive outer ring 24 B, and each ball 24 C.
  • the second conductive inner ring 24 A and the second conductive outer ring 24 B are electrically insulated from each ball 24 C.
  • the outer diameter of the second bearing 24 (specifically, the second conductive outer ring 24 B) is approximately equal to the inner diameter of a second housing 52 of the bracket 5 B.
  • the second bearing 24 (specifically, the second conductive outer ring 24 B) is fixed to the conductive housing 5 (specifically, the second housing 52 of the bracket 5 B), for example, by press fit or adhesive.
  • the second conductive outer ring 24 B is in contact with the conductive housing 5 .
  • the second bearing 24 (specifically, the second conductive outer ring 24 B) may be disposed in the conductive housing 5 (specifically, the second housing 52 of the bracket 5 B) by clearance fit.
  • the thickness of the oil film layer is, for example, equal to or less than 1 ⁇ m, but the thickness of the oil film layer varies depending on several factors, such as the rotational speed of the rotor 2 or the temperature in the electric motor 1 .
  • a preload spring is provided between the second bearing 24 and the bracket 5 B (specifically, the second housing 52 ) to provide preload in the axial direction to the second bearing 24 . Since the preload in the axial direction is provided to the first bearing 23 and the second bearing 24 by the preload spring, the rattling of the balls 23 C and 24 C during the rotation of the rotor 2 can be prevented.
  • the size of the first bearing 23 is equal to the size of the second bearing 24 .
  • the outer diameter (i.e., diameter) of the first conductive outer ring 23 B is equal to the outer diameter (i.e., diameter) of the second conductive outer ring 24 B.
  • Each of the first bearing 23 and the second bearing 24 is, for example, a deep groove ball bearing of the bearing number 608 with an outer diameter of 22 mm, an inner diameter of 8 mm, and a width of 7 mm.
  • the size of the first bearing 23 is equal to the size of the second bearing 24 , but the size of the first bearing 23 may be different from that of the second bearing 24 .
  • the conductive housing 5 includes the frame 5 A in which the stator 3 and the rotor 2 are disposed and the bracket 5 B that covers the interior of the frame 5 A.
  • the stator 3 and the rotor 2 are disposed in the conductive housing 5 (specifically, frame 5 A).
  • the conductive housing 5 is made of, for example, metal, such as iron.
  • the frame 5 A is a conductive frame.
  • the frame 5 A is made of, for example, metal, such as iron.
  • the inner surface of the frame 5 A is mechanically and electrically connected to the outer peripheral surface of the stator core 31 .
  • the stator 3 is grounded through the frame 5 A.
  • the frame 5 A is, for example, a cup-shaped frame.
  • the frame 5 A includes the first housing 51 in which the first bearing 23 is disposed.
  • the first housing 51 is part of the frame 5 A and is located at the bottom of the frame 5 A. In the example shown in FIG. 1 , the first housing 51 is part of the bottom of the frame 5 A that projects in the axial direction and a direction perpendicular to the axial direction in the xy-plane.
  • the first conductive outer ring 23 B of the first bearing 23 is in contact with the first housing 51 .
  • the first housing 51 includes a through hole 51 A, and the conductive shaft 21 protrudes to an area outside the frame 5 A through the through hole 51 A.
  • the bracket 5 B is a conductive bracket.
  • the bracket 5 B is made of, for example, metal, such as iron.
  • the frame 5 A and the bracket 5 B are electrically connected to each other.
  • the bracket 5 B includes the second housing 52 in which the second bearing 24 is disposed. Part of the bracket 5 B other than the second housing 52 is, for example, a flat plate.
  • the second housing 52 is part of the bracket 5 B that projects in the axial direction from the flat plate. In the example shown in FIG. 1 , the second conductive outer ring 24 B of the second bearing 24 is in contact with the second housing 52 .
  • the first conductive outer ring 23 B of the first bearing 23 and the second conductive outer ring 24 B of the second bearing 24 can be made equipotential with a simple configuration, and thus the bearing voltage can be reduced.
  • the conductive housing 5 may further include a circuitry cover 5 C.
  • the circuitry cover 5 C is a conductive cover.
  • the circuitry cover 5 C is made of, for example, metal, such as iron.
  • the circuitry cover 5 C may be made of resin.
  • the circuitry cover 5 C covers the electric circuitry 6 .
  • the circuitry cover 5 C covers the electric circuitry 6 together with the bracket 5 B.
  • the electric circuitry 6 is disposed in the conductive housing 5 , but part or all of the electric circuitry 6 may be disposed outside the conductive housing 5 .
  • Each of the frame 5 A, the bracket 5 B, and the circuitry cover 5 C includes a flange 53 that forms an outer edge.
  • the flanges 53 of the frame 5 A, the bracket 5 B, and the circuitry cover 5 C are fixed to each other, for example, by a screw.
  • the frame 5 A, the bracket 5 B, and the circuitry cover 5 C are mechanically coupled together and electrically connected to each other.
  • the conductive housing 5 is divided by the bracket 5 B into a motor housing section 54 in which the rotor 2 and the stator 3 are disposed and a circuit housing section 55 in which the electric circuitry 6 is disposed.
  • the frame 5 A, the bracket 5 B, and the circuitry cover 5 C may be electrically connected to each other.
  • the frame 5 A and the bracket 5 B are made of conductive material, but either the frame 5 A or the bracket 5 B may be made of non-conductive material such as non-conductive resin, or both the frame 5 A and the bracket 5 B may be made of non-conductive material such as non-conductive resin.
  • a non-conductive member such as a non-conductive resin, may be disposed between the first conductive inner ring 23 A and the conductive shaft 21 . This configuration can reduce the bearing voltage in the first bearing 23 .
  • the non-conductive resin described above is, for example, a bulk molding compound resin (BMC resin) such as unsaturated polyester.
  • BMC resin bulk molding compound resin
  • the accuracy of the dimensions of the components can be enhanced, and the mechanical strength of the electric motor 1 can be increased.
  • the connector 7 is fixed to the circuitry cover 5 C.
  • the connector 7 includes wiring and a non-conductive cover covering the wiring, for example.
  • the wiring of the connector 7 is connected to the electric circuitry 6 .
  • FIG. 6 is a diagram schematically showing a fan 9 according to a second embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US18/704,714 2021-12-28 2021-12-28 Rotor, electric motor, fan, ventilator, and air conditioner Pending US20250219485A1 (en)

Applications Claiming Priority (1)

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PCT/JP2021/048762 WO2023127084A1 (ja) 2021-12-28 2021-12-28 ロータ、モータ、ファン、換気扇、及び空気調和機

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US20250219485A1 true US20250219485A1 (en) 2025-07-03

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JP (1) JP7675855B2 (https=)
CN (1) CN118414765A (https=)
WO (1) WO2023127084A1 (https=)

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WO2025104787A1 (ja) * 2023-11-13 2025-05-22 三菱電機株式会社 電動機、送風機、ポンプおよび空気調和装置

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